HAMOUD, A. A.; SHARIF, A. A.; GHADLE, K. P. Existence, Uniqueness and Stability Results of Fractional Volterra-Fredholm Integro Differential Equations of $psi$-Hilfer Type. Discontinuity, Nonlinearity, and Complexity, v. 10, n. 3, p. 535–545, 17 Aug.2026.